A note on Kirillov model for representations of ${GL}_n(\mathbb{C})$

Let $G=GL_{n}(\mathbb{C})$ and $1\neψ:\mathbb{C}\to\mathbb{C}^{\times}$ be an additive character. Let $U$ be the subgroup of upper triangular unipotent matrices in $G$. Denote by $θ$ the character $θ:U\to\mathbb{C}$ given by $θ(u):=ψ(u_{1,2}+u_{2,3}+...+u_{n-1,n}).$ Let $P$ be the mirabolic subgroup of $G$ consisting of all matrices in $G$ with the last row equal to $(0,0,...,0,1)$. We prove that if $π$ is an irreducible generic representation of $GL_{n}(\mathbb{C})$ and $\mathcal{W}(π,ψ)$ is its Whittaker model, then the space $\{f|_{P}:P\to \mathbb{C}:\, f\in \mathcal{W}(π,ψ)\}$ contains the space of infinitely differentiable functions $f:P\to \mathbb{C}$ which satisfy $f(up)=ψ(u)f(p)$ for all $u\in U$ and $p\in P$ and which have a compact support modulo $U$. A similar result was proven for $GL_{n}(F)$, where $F$ is a $p$-adic field by Gelfand and Kazhdan in "Representations of the group $GL(n,K)$ where K is a local field", Lie groups and their representations, Proc. Summer School, Bolyai János Math. Soc., Budapest:95-118, 1975, and for $GL_{n}(\mathbb{R})$ by Jacquet in "Distinction by the quasi-split unitary group", Israel Journal of Mathematics, 178(1):269-324, 2010.

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